CA1131674A - Joint sealing structure - Google Patents
Joint sealing structureInfo
- Publication number
- CA1131674A CA1131674A CA355,610A CA355610A CA1131674A CA 1131674 A CA1131674 A CA 1131674A CA 355610 A CA355610 A CA 355610A CA 1131674 A CA1131674 A CA 1131674A
- Authority
- CA
- Canada
- Prior art keywords
- sealing
- spring
- stiffener
- seal
- joint according
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 87
- 239000003351 stiffener Substances 0.000 claims abstract description 34
- 230000033001 locomotion Effects 0.000 claims abstract description 24
- 230000009975 flexible effect Effects 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 8
- 238000005299 abrasion Methods 0.000 claims description 4
- 239000003566 sealing material Substances 0.000 claims description 2
- 230000002093 peripheral effect Effects 0.000 claims 1
- 230000003068 static effect Effects 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 2
- 239000002184 metal Substances 0.000 description 3
- 229920003002 synthetic resin Polymers 0.000 description 3
- 239000000057 synthetic resin Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 230000001815 facial effect Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/84—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/85—Chromium, molybdenum or tungsten
- B01J23/88—Molybdenum
- B01J23/882—Molybdenum and cobalt
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
- B01J35/51—Spheres
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0215—Coating
- B01J37/0221—Coating of particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0215—Coating
- B01J37/0221—Coating of particles
- B01J37/0223—Coating of particles by rotation
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10G—CRACKING HYDROCARBON OILS; PRODUCTION OF LIQUID HYDROCARBON MIXTURES, e.g. BY DESTRUCTIVE HYDROGENATION, OLIGOMERISATION, POLYMERISATION; RECOVERY OF HYDROCARBON OILS FROM OIL-SHALE, OIL-SAND, OR GASES; REFINING MIXTURES MAINLY CONSISTING OF HYDROCARBONS; REFORMING OF NAPHTHA; MINERAL WAXES
- C10G45/00—Refining of hydrocarbon oils using hydrogen or hydrogen-generating compounds
- C10G45/02—Refining of hydrocarbon oils using hydrogen or hydrogen-generating compounds to eliminate hetero atoms without changing the skeleton of the hydrocarbon involved and without cracking into lower boiling hydrocarbons; Hydrofinishing
- C10G45/04—Refining of hydrocarbon oils using hydrogen or hydrogen-generating compounds to eliminate hetero atoms without changing the skeleton of the hydrocarbon involved and without cracking into lower boiling hydrocarbons; Hydrofinishing characterised by the catalyst used
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/76—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/84—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36 with arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
- B01J23/85—Chromium, molybdenum or tungsten
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/31—Density
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Chemical & Material Sciences (AREA)
- Catalysts (AREA)
- Sealing With Elastic Sealing Lips (AREA)
Abstract
Abstract A joint sealing structure for use in sealing relatively axially movable members of a joint over a wide range of such axial movement includes a seal ring having a sealing lip having a maintained dynamic seal with a sealing surface of one of the joint members. A stiffener is provided for transferring biasing force from a spring to the sealing lip. The stiffener may be provided with a flexible connecting portion permitting free movement of the sealing lip under the biasing action of the spring over the range of movement between the joint members. In one form, a base may be provided to which the connecting portion is mounted, the base being fitted into the counterbore of the joint member so as to provide a static seal therebetween. The base may be provided with a turned flange for carrying the outer portion of the spring for free movement of the spring in maintaining the biasing action.
The spring may comprise a Belleville spring arrangement to pass over center over the range of movement of the joint members so as to provide an effectively constant spring biasing force to the sealing lip. The arrangement has the advantage of simplicity of construction.
The spring may comprise a Belleville spring arrangement to pass over center over the range of movement of the joint members so as to provide an effectively constant spring biasing force to the sealing lip. The arrangement has the advantage of simplicity of construction.
Description
D~scription Joint Sealing Structure Technical Field This invention relates to seals and in particu-lar to boot-type face seals having associated spring means for maintaining sealing engagement thereof.
Background Art In U. S. Letters Patent 3,614,113 of Duane L.
Burke, which patent is owned by the assignee hereof, a boot-type seal is shown for use in sealing a track pin assembly. The seal includes Belleville spring means for biasing opposed portions of the boot into sealing engagement with confronting surfaces of the members to be sealed. The legs of the boot engaged by the opposed Bellevill~ springs are resilient and a bight portion of the boot provides a static seal with a radially out-er surface of one of the members to be sealed.
In U. S. Letters Paten-t 3,269,738, Herman Baumler et al show a seal for use in rotary piston --motors wherein a disc spring is embedded in an elasticbody and removably connected with a glide ringO The disc spring may be radially slotted.
In U. S. Letters Patent 3,370,895 of George A.
Cason, Jr., a seal is shown for use with drilling bits wherein a spring is provided within a rubber sealing ring. The sealing ring, in turn, is bonded to a resil-ient holding ring. ~ther patents of less pertinency, while showing a number of different forms of seals, are those of George E. Dunn U. S. Patent 2,338,169; F. W.
30 Koller U. S. Patent 2,481,430; Bernard F. Kupfert et al U. S. Patent 2,814,513; Fred E. Simpson et al U. S.
Patent 3,050,346; Harold L. Reinsma U. S. Patant 3,218,107, which patent is owned by the assignee 3~ :
.
.
7~
hereof; Seisakusho sritish Patent 1,~25,364; and Japanese Patent 131,725.
Disclosure of the Invention _ The present invention comprehends a joint having a first member defining a cylindrical axially outwardly opening recess, a second member adjacent to the first member and defining a sealing surface confronting the recessl the members being associated so as to have relative rotational movement about the axis of the recess and relative movement towards and away from one another in the direction of the axis, and a sealing assembly in the recess for seal.ing the members, the sealing assembly being characterized by an annular support member having a radially inner substantially rigid stiffener portion, and a radially outer flexible connecting portion which is sealed to the one member and is radially compressed between the stiffener portion and the one member; an annular seal formed of sealing material having high wear and abrasion resistance, the seal extending axially from-the stiffener portion and defining a sealing lip which sealing engages the confronting sealing surface; and spring means at the axially inner end of the recess and acting effectively between the first member and the stiffener portion of the support member to urge the lip into continuing sealed engagement with the sealing surface notwithstanding relatively axial movement betw~en the members.
~' . . .
The sealing structure of the present invention is extremely simple and economical of construction while yet providing the highly desirable features dis-cussed above.
Brief Description of the Drawing FIGURE 1 is a fragmentary section of a joint having a sealing structure embodying -the invention;
FIGURE 2 is a fragmentary enlarged section of the sealing structure;
~; 10 FIGURE 3 is a plan view in partial section of the seal stiffener;
FIGURE 4 is a fragmentary section illustrating a modified form of joint embodying the invention; and FIGURE 5 is a fragmentary section illustrating still another modified form of sealing structure em-bodying the invention.
Best Mode for Carrying Out the Invention In the exemplary embodiment of the invention ; as shown in Figures 1~3 of the drawing, a joint 10 is shown to include a first member, herein a link 11 connected to a link 12 by a pin 13. The illustrated ~ joint comprises a track joint, such as for use in a ~ tractor or the like.
The outer end of the pin is press-fitted in by the li.nk 11 and an inner portion of the pin is rota-; tionally fitted in a second member, herein a bushing 14 in link 12. Axial movement between the bushing 14 and link 11 is limited by a thrust ring 15 which, as shown in Figure 2, cooperates with the axially outer inwardly facing surface 16 and the radially outer radiallyinwardly facing surface 17 with a counterbore in link 11 to define a seal space 18. The invention comprehends the provision of an improved sealing structure 19 within seal space 18 for effectively sealing the joint membersll and 14 to each ' :
3~
other notwithstanding a substantial axial movement therebetween.
More specifically, as best seen in Figure 2, sealing structure 19 includes a seal ring 20 having a lip portion 21 engaging the axially outer sealing surface 22 of the bushing.
The seal ring is carried by an annular stiffener 23 which, as shown in Figure 2, may have a T-section including a radially extending leg portion 24 having a plurality of openings 25 through which the sealing ring 20 is mol~ed. Seal ring 20 may be formed of any suitable highly abrasion-resistant sealable mold material, one example thereof being polyurethane.
The stiffener 23 may further include a trans versely extending head portion 26 which is bonded to a resilient annular connecting portion 27 in turn bonded to a rigid annular base 28 which may be formed of a material, such as metal. Base 28 is fitted into cylindrical surface 17 of recess 18 and, in the illustrated embodiment, is press fitted thereinto so as to provide a static seal therewith.
Sealing structure 19 further includes annular spring means generally designated 29 which, in the illus-trated embodiment comprises Belleville spring means including a first axially outer spring 30 and a second axially inner spring 31. Inner spring 31 has a spring rate sufficiently high to force outer spring 30 past its flat deflected position as the spacing between members 11 and 14 increases, thereby providing a substantially constant spring force to the seal lip over the normal working range of the seal. Base portion 28 of the stiffener is provided with a radially inturned flange 32.
The radially outer portion 33 of spring 30 bears against the flange 32 to provide a freely movable support for the spring means 29. The radially inner portion 34 of spring 30 engages the radially , -' ~3~6~L
inner portion 35 of spring 31. The radially outer por-tion 36 of spring 31 engages the stiffener leg portion 24 axially outwardly of lip 21 of seal ring 20 so as to provide a spring biasing force acting generally axially toward the lip portion through the stiffener and seal ring 20, as shown in Figure 2.
Stiffener portion 23,24,26 may be formed of a rigid material, such as metal or hard synthetic resin, so as to provide a positive transmission of spring force to the sealing ring 20 and provide an improved dynamic seal of lip 21 with the joint member surface 22.
The Belleville spring means permits substantial axial movement between joint members 14 and 11 and, thus, between surfaces 16 and 22 without substantial change in the sealing action of lip 21 against sealing surface 22. Thus, the flexible connecting portion 27 of the stiffener means assures free movement of the sealing ring 20 under the biasing action of spring means 29 over a substantial range of axial displacement of surface 22 relative to surface 16 while effectively maintaining the lip 21 stabilized at the confronting portion of sealing surface 22.
To further effectively stabilize the action of the sealing structure 19, the Belleville spring is arranged to deflect past its flat position within the range of movement of the joint members so that the var-iation in spring force is effectively minimized.
Referring to Figure 3, stiffener leg portion 24 may be provided with six openings 25 equiangularly ; spaced about the axis of the annular stiffener for improved distributed securing of the seal ring thereto.
Referring now to the embodiment of Figure 4, a modified form of sealing structure generally designated 119 is shown to comprise a structure generally similar to that of sealing structure l9 but wherein the sealing :
1~L3~67~
ring and stiffener inner portion define a unitary element 137. The spring means generally designated 129 comprises a pair of Belleville springs 130 and 131 loaded in series. The springs are arranged to accommodate the axial seal travel over a relatively flat portion of the total series spring rate curve without passing the flat position. The radially outer portion 133 of spring 130 engages the ~oint member surface 16 and the radially outer portion 136 of the spring 131 engages a radially inner 10 portion 124 of the element 137. Element 137 further defines a sealing lip portion 121 sealingly engaging the joint sealing surface 22 and is maintained in dynamic sealing engagement therewith by the spring means 129 acting through the element 137.
A resilient connecting portion 127 is bonded to the element 137 and is compressed within the counterbore surface 17 to provide a static seal therewith.
Thus, the sealing structure 119 provides an improved dynamic seal of lip 121 with the joint sealing surface 22 over a wide range of movement between the joint members 14 and 11 as in the embodiment of Figures 1-3 as a result of the maintained sealing force provided by spring means 129 through the stiffener and sealing element 137 to the lip portion 121 thereof with such movement being freely permitted by the flexible connecting portion 127 of the sealing structure.
In the illustrated embodiment, the element 137 is formed of an abrasion-resistant, relatively hard t high modulus, sealable synthetic resin, such as hard polyurethane. As will be obvious to those skilled in the art, other suitable materials may be utilized for the stiffener and sealing element.
A further modified form of sealing structure generally designated 219 is illustrated in Figure 5.
. i Sealing structure 219 is generally similar to sealing structure 19 but utilizes a T-shaped stiffener element 223 having the seal ring 22~ bonded thereto so as to dispose the sealing lip 221 in sealing engage-ment with the joint member surface 22. The head portion226 of the stiffener is bonded to a connecting portion 227 which, in turn, is received in the counterbore 17 of the link 11 so as to have a static seal therewith.
Spring means 229 may be provided in the form of a pair of annular Belleville springs 230 and 231 loaded in series and functioning in the manner previously des-cribed relative to spring means 129. The radially outer portion 233 of spring 230 engages the joint member sur-face 16 and the radially outer portion 236 of the spring 231 engages the leg portion 224 of the stiffener 223 generally axially outwardly of the sealing lip 221 so as to provide a maintained biasing of the sealing lip against the sealing surface 22 at all times notwith-standing a substantial axial movement between the joint ~0 member surfaces 22 and 16.
Movement of the sealing lip 221 to follow move-ment of the surface 22 is readily permitted by the flex-ible connecting portion 227 under the biasing action of the spring means. The stiffener may be formed of any suitable material r su~h as metal or relatively hard synthetic resin, so as to provide a positive transmis-sion of the biasing force to the sealing lip, as dis-cussed above.
Thus, each of the em~odiments of the invention as discussed above provides an improved maintained sealing of the seal ring lip with the confronting joint sealing surface over a wide range of axial movement of that surface relative to the opposed joint member. The invention comprehends providing an improved stiffener for transmitting a substantially constant spring bias-;7~
ing force to the sealing lip and further contemplatesproviding a connecting portion of the seal which per-mits such constant spring force to be applied to the sealing lip over a wide range of movement between the joint members.
Similar elements of each of the different em-bodiments are identified by similar reference numerals but 100 different.
Industrial Applicability The sealing structure of the present invention may be utilized in a wide range of different indus-trial applications. In the illustrated embodiment, the sealing structure is utilized in a track joint wherein the track links are movably connected by a pin and wherein maintained lubrication is a desideratum.
As will be obvious to those skilled in the art, the improved sealing structure is advantageously employed wherever an annular seal is utilized in sealing joint members having substantial relative axial movement therebetween and in an abrasive external environment.
The improved novel sealing structure of the present invention provides a number of highly desira-ble features in such track joint applications. More specifically, the provision of the connecting portion of the seal as a separate element permits it to be formed of a material having optimum resilience char-acteristics over a wide temperature range as this por-tion of the seal does not perform the sealing function.
Reversely, as the seal ring portion of the sealing structure is divorced from any requirement for flex-ibly supporting the structure, it may be formed of a material having optimum and uncompromised wear and abrasion-resistance so as to define an optimum seal-ing element.
Still further, as the sealing structure may be 7~
g formed by swaging the base element radially inwardly, the connecting portion of the sealing structure may be placed in radial compression to reduce fatigue in the operation of the sealing structure.
The sealing structure may comprise a permanent-ly encapsulated assembly which is effectively tamper-proof as it effectively prevents unauthorized disassem-bly without destroying the base element configuration.
Further, the base element flange provides an improved hard wear bearing portion for the Belleville springs so as to permit controlled supported deflec-tion of the springs in the operation of the sealing structure.
The Belleville springs may have different spring rates so as to provide improved loading char-acteristics in the sealing structure. Thus, the inner spring engaging the stiffener, or seal, may have a relatively high spring rate with the outer spring having a relatively lower spring rate to permit facili-tated deflection past the flat position thereof inachieving the desired relatively constant load char-acteristic of the sealing structure.
As indicated above, the invention comprehends that the springs may be utilized alternatively to move past the flat position or reach the flat position in the maximum travel position thereof in the operation of the sealing structure. In either mode of utiliza-tion, the springs provide an improved flat load char-acteristic.
In the forms of the invention wherein the rigid base member is not utilized, the resilient connection portion may be compressed within the joint bore in direct facial contact with the joint so as to provide an improved modified form of sealing structure as dis-cussed above.
6~
Other aspects, objects and advantages of this invent~on can be obtained from a study of the draw-ings, the disclosure and the appended claims. The foregoing disclosure of specific embodiments is il-lustrative of the broad inventive concepts comprehendedby the invention.
Background Art In U. S. Letters Patent 3,614,113 of Duane L.
Burke, which patent is owned by the assignee hereof, a boot-type seal is shown for use in sealing a track pin assembly. The seal includes Belleville spring means for biasing opposed portions of the boot into sealing engagement with confronting surfaces of the members to be sealed. The legs of the boot engaged by the opposed Bellevill~ springs are resilient and a bight portion of the boot provides a static seal with a radially out-er surface of one of the members to be sealed.
In U. S. Letters Paten-t 3,269,738, Herman Baumler et al show a seal for use in rotary piston --motors wherein a disc spring is embedded in an elasticbody and removably connected with a glide ringO The disc spring may be radially slotted.
In U. S. Letters Patent 3,370,895 of George A.
Cason, Jr., a seal is shown for use with drilling bits wherein a spring is provided within a rubber sealing ring. The sealing ring, in turn, is bonded to a resil-ient holding ring. ~ther patents of less pertinency, while showing a number of different forms of seals, are those of George E. Dunn U. S. Patent 2,338,169; F. W.
30 Koller U. S. Patent 2,481,430; Bernard F. Kupfert et al U. S. Patent 2,814,513; Fred E. Simpson et al U. S.
Patent 3,050,346; Harold L. Reinsma U. S. Patant 3,218,107, which patent is owned by the assignee 3~ :
.
.
7~
hereof; Seisakusho sritish Patent 1,~25,364; and Japanese Patent 131,725.
Disclosure of the Invention _ The present invention comprehends a joint having a first member defining a cylindrical axially outwardly opening recess, a second member adjacent to the first member and defining a sealing surface confronting the recessl the members being associated so as to have relative rotational movement about the axis of the recess and relative movement towards and away from one another in the direction of the axis, and a sealing assembly in the recess for seal.ing the members, the sealing assembly being characterized by an annular support member having a radially inner substantially rigid stiffener portion, and a radially outer flexible connecting portion which is sealed to the one member and is radially compressed between the stiffener portion and the one member; an annular seal formed of sealing material having high wear and abrasion resistance, the seal extending axially from-the stiffener portion and defining a sealing lip which sealing engages the confronting sealing surface; and spring means at the axially inner end of the recess and acting effectively between the first member and the stiffener portion of the support member to urge the lip into continuing sealed engagement with the sealing surface notwithstanding relatively axial movement betw~en the members.
~' . . .
The sealing structure of the present invention is extremely simple and economical of construction while yet providing the highly desirable features dis-cussed above.
Brief Description of the Drawing FIGURE 1 is a fragmentary section of a joint having a sealing structure embodying -the invention;
FIGURE 2 is a fragmentary enlarged section of the sealing structure;
~; 10 FIGURE 3 is a plan view in partial section of the seal stiffener;
FIGURE 4 is a fragmentary section illustrating a modified form of joint embodying the invention; and FIGURE 5 is a fragmentary section illustrating still another modified form of sealing structure em-bodying the invention.
Best Mode for Carrying Out the Invention In the exemplary embodiment of the invention ; as shown in Figures 1~3 of the drawing, a joint 10 is shown to include a first member, herein a link 11 connected to a link 12 by a pin 13. The illustrated ~ joint comprises a track joint, such as for use in a ~ tractor or the like.
The outer end of the pin is press-fitted in by the li.nk 11 and an inner portion of the pin is rota-; tionally fitted in a second member, herein a bushing 14 in link 12. Axial movement between the bushing 14 and link 11 is limited by a thrust ring 15 which, as shown in Figure 2, cooperates with the axially outer inwardly facing surface 16 and the radially outer radiallyinwardly facing surface 17 with a counterbore in link 11 to define a seal space 18. The invention comprehends the provision of an improved sealing structure 19 within seal space 18 for effectively sealing the joint membersll and 14 to each ' :
3~
other notwithstanding a substantial axial movement therebetween.
More specifically, as best seen in Figure 2, sealing structure 19 includes a seal ring 20 having a lip portion 21 engaging the axially outer sealing surface 22 of the bushing.
The seal ring is carried by an annular stiffener 23 which, as shown in Figure 2, may have a T-section including a radially extending leg portion 24 having a plurality of openings 25 through which the sealing ring 20 is mol~ed. Seal ring 20 may be formed of any suitable highly abrasion-resistant sealable mold material, one example thereof being polyurethane.
The stiffener 23 may further include a trans versely extending head portion 26 which is bonded to a resilient annular connecting portion 27 in turn bonded to a rigid annular base 28 which may be formed of a material, such as metal. Base 28 is fitted into cylindrical surface 17 of recess 18 and, in the illustrated embodiment, is press fitted thereinto so as to provide a static seal therewith.
Sealing structure 19 further includes annular spring means generally designated 29 which, in the illus-trated embodiment comprises Belleville spring means including a first axially outer spring 30 and a second axially inner spring 31. Inner spring 31 has a spring rate sufficiently high to force outer spring 30 past its flat deflected position as the spacing between members 11 and 14 increases, thereby providing a substantially constant spring force to the seal lip over the normal working range of the seal. Base portion 28 of the stiffener is provided with a radially inturned flange 32.
The radially outer portion 33 of spring 30 bears against the flange 32 to provide a freely movable support for the spring means 29. The radially inner portion 34 of spring 30 engages the radially , -' ~3~6~L
inner portion 35 of spring 31. The radially outer por-tion 36 of spring 31 engages the stiffener leg portion 24 axially outwardly of lip 21 of seal ring 20 so as to provide a spring biasing force acting generally axially toward the lip portion through the stiffener and seal ring 20, as shown in Figure 2.
Stiffener portion 23,24,26 may be formed of a rigid material, such as metal or hard synthetic resin, so as to provide a positive transmission of spring force to the sealing ring 20 and provide an improved dynamic seal of lip 21 with the joint member surface 22.
The Belleville spring means permits substantial axial movement between joint members 14 and 11 and, thus, between surfaces 16 and 22 without substantial change in the sealing action of lip 21 against sealing surface 22. Thus, the flexible connecting portion 27 of the stiffener means assures free movement of the sealing ring 20 under the biasing action of spring means 29 over a substantial range of axial displacement of surface 22 relative to surface 16 while effectively maintaining the lip 21 stabilized at the confronting portion of sealing surface 22.
To further effectively stabilize the action of the sealing structure 19, the Belleville spring is arranged to deflect past its flat position within the range of movement of the joint members so that the var-iation in spring force is effectively minimized.
Referring to Figure 3, stiffener leg portion 24 may be provided with six openings 25 equiangularly ; spaced about the axis of the annular stiffener for improved distributed securing of the seal ring thereto.
Referring now to the embodiment of Figure 4, a modified form of sealing structure generally designated 119 is shown to comprise a structure generally similar to that of sealing structure l9 but wherein the sealing :
1~L3~67~
ring and stiffener inner portion define a unitary element 137. The spring means generally designated 129 comprises a pair of Belleville springs 130 and 131 loaded in series. The springs are arranged to accommodate the axial seal travel over a relatively flat portion of the total series spring rate curve without passing the flat position. The radially outer portion 133 of spring 130 engages the ~oint member surface 16 and the radially outer portion 136 of the spring 131 engages a radially inner 10 portion 124 of the element 137. Element 137 further defines a sealing lip portion 121 sealingly engaging the joint sealing surface 22 and is maintained in dynamic sealing engagement therewith by the spring means 129 acting through the element 137.
A resilient connecting portion 127 is bonded to the element 137 and is compressed within the counterbore surface 17 to provide a static seal therewith.
Thus, the sealing structure 119 provides an improved dynamic seal of lip 121 with the joint sealing surface 22 over a wide range of movement between the joint members 14 and 11 as in the embodiment of Figures 1-3 as a result of the maintained sealing force provided by spring means 129 through the stiffener and sealing element 137 to the lip portion 121 thereof with such movement being freely permitted by the flexible connecting portion 127 of the sealing structure.
In the illustrated embodiment, the element 137 is formed of an abrasion-resistant, relatively hard t high modulus, sealable synthetic resin, such as hard polyurethane. As will be obvious to those skilled in the art, other suitable materials may be utilized for the stiffener and sealing element.
A further modified form of sealing structure generally designated 219 is illustrated in Figure 5.
. i Sealing structure 219 is generally similar to sealing structure 19 but utilizes a T-shaped stiffener element 223 having the seal ring 22~ bonded thereto so as to dispose the sealing lip 221 in sealing engage-ment with the joint member surface 22. The head portion226 of the stiffener is bonded to a connecting portion 227 which, in turn, is received in the counterbore 17 of the link 11 so as to have a static seal therewith.
Spring means 229 may be provided in the form of a pair of annular Belleville springs 230 and 231 loaded in series and functioning in the manner previously des-cribed relative to spring means 129. The radially outer portion 233 of spring 230 engages the joint member sur-face 16 and the radially outer portion 236 of the spring 231 engages the leg portion 224 of the stiffener 223 generally axially outwardly of the sealing lip 221 so as to provide a maintained biasing of the sealing lip against the sealing surface 22 at all times notwith-standing a substantial axial movement between the joint ~0 member surfaces 22 and 16.
Movement of the sealing lip 221 to follow move-ment of the surface 22 is readily permitted by the flex-ible connecting portion 227 under the biasing action of the spring means. The stiffener may be formed of any suitable material r su~h as metal or relatively hard synthetic resin, so as to provide a positive transmis-sion of the biasing force to the sealing lip, as dis-cussed above.
Thus, each of the em~odiments of the invention as discussed above provides an improved maintained sealing of the seal ring lip with the confronting joint sealing surface over a wide range of axial movement of that surface relative to the opposed joint member. The invention comprehends providing an improved stiffener for transmitting a substantially constant spring bias-;7~
ing force to the sealing lip and further contemplatesproviding a connecting portion of the seal which per-mits such constant spring force to be applied to the sealing lip over a wide range of movement between the joint members.
Similar elements of each of the different em-bodiments are identified by similar reference numerals but 100 different.
Industrial Applicability The sealing structure of the present invention may be utilized in a wide range of different indus-trial applications. In the illustrated embodiment, the sealing structure is utilized in a track joint wherein the track links are movably connected by a pin and wherein maintained lubrication is a desideratum.
As will be obvious to those skilled in the art, the improved sealing structure is advantageously employed wherever an annular seal is utilized in sealing joint members having substantial relative axial movement therebetween and in an abrasive external environment.
The improved novel sealing structure of the present invention provides a number of highly desira-ble features in such track joint applications. More specifically, the provision of the connecting portion of the seal as a separate element permits it to be formed of a material having optimum resilience char-acteristics over a wide temperature range as this por-tion of the seal does not perform the sealing function.
Reversely, as the seal ring portion of the sealing structure is divorced from any requirement for flex-ibly supporting the structure, it may be formed of a material having optimum and uncompromised wear and abrasion-resistance so as to define an optimum seal-ing element.
Still further, as the sealing structure may be 7~
g formed by swaging the base element radially inwardly, the connecting portion of the sealing structure may be placed in radial compression to reduce fatigue in the operation of the sealing structure.
The sealing structure may comprise a permanent-ly encapsulated assembly which is effectively tamper-proof as it effectively prevents unauthorized disassem-bly without destroying the base element configuration.
Further, the base element flange provides an improved hard wear bearing portion for the Belleville springs so as to permit controlled supported deflec-tion of the springs in the operation of the sealing structure.
The Belleville springs may have different spring rates so as to provide improved loading char-acteristics in the sealing structure. Thus, the inner spring engaging the stiffener, or seal, may have a relatively high spring rate with the outer spring having a relatively lower spring rate to permit facili-tated deflection past the flat position thereof inachieving the desired relatively constant load char-acteristic of the sealing structure.
As indicated above, the invention comprehends that the springs may be utilized alternatively to move past the flat position or reach the flat position in the maximum travel position thereof in the operation of the sealing structure. In either mode of utiliza-tion, the springs provide an improved flat load char-acteristic.
In the forms of the invention wherein the rigid base member is not utilized, the resilient connection portion may be compressed within the joint bore in direct facial contact with the joint so as to provide an improved modified form of sealing structure as dis-cussed above.
6~
Other aspects, objects and advantages of this invent~on can be obtained from a study of the draw-ings, the disclosure and the appended claims. The foregoing disclosure of specific embodiments is il-lustrative of the broad inventive concepts comprehendedby the invention.
Claims (11)
1. A joint having a first member defining a cylindrical axially outwardly opening recess, a second member adjacent to the first member and defining a sealing surface confronting the recess, the members being associated so as to have relative rotational movement about the axis of the recess and relative movement towards and away from one another in the direction of the axis, and a sealing assembly in the recess for sealing the members, the sealing assembly being characterized by an annular support member having a radially inner substan-tially rigid stiffener portion, and a radially outer flexible connection portion which is sealed to the first member and is radially compressed between the stiffener portion and the first member; an annular seal formed of sealing material having high wear and abrasion resistance, the seal extending axially from the stiffener portion and defining a sealing lip which sealingly engages the confronting sealing surface; and spring means at the axially inner end of the recess and acting effectively between the first member and the stiffener portion of the support member to urge the lip into continuing sealed engagement with the sealing surface notwithstanding relatively axial movement between the members.
2. A joint according to claim 1, wherein the connecting portion is statically sealed relatively to a peripheral wall of the recess.
3. A joint according to claim 1, wherein a rigid annular base member is received coaxially within the radially outer part of the recess and the support member connecting portion is received coaxially within the base member.
4. A joint according to claim 3, wherein the base member has a radially inturned flange at the inner end of the recess, the spring means engaging the flange.
5. A joint according to claim 1, wherein the support member connecting portion is bonded to the support member stiffener portion.
6. A joint according to claim 1, wherein the seal is formed integrally with the stiffener portion.
7. A joint according to claim 1, wherein the stiffener portion has in axial section, a radially outer head portion which is fixed to the support member connecting portion; and, extending radially inwardly from the head portion, a leg portion which is engaged on one axial side by the spring means and from the other axial side of which the seal extends.
8. A joint according to claim 7, wherein the leg portion has spaced holes through which the material of the seal is molded.
9. A joint according to claim 1, wherein the spring means comprises Belleville spring means.
10. A joint according to claim 9, wherein the Belleville spring means comprises an axially inner Belle-ville spring which takes a reaction from the first member and an axially outer Belleville spring engaging the stiffener portion, the Belleville springs contacting one another at the radially inner ends thereof and diverging from one another radially outwardly.
11. A joint according to claim 1 wherein the radially outer flexible connecting portion is separated from the annular seal by the substantially rigid stiffener portion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US06/000,844 US4255253A (en) | 1979-01-03 | 1979-01-03 | Hydrogen processing of hydrocarbon feeds using coated catalysts |
| US79/00844 | 1979-10-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1131674A true CA1131674A (en) | 1982-09-14 |
Family
ID=21693248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA355,610A Expired CA1131674A (en) | 1979-01-03 | 1980-07-07 | Joint sealing structure |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US4255253A (en) |
| CA (1) | CA1131674A (en) |
Families Citing this family (33)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| HU191810B (en) * | 1981-09-21 | 1987-04-28 | Mta Mueszaki Kemiai Kutato Int | Bifunctional catalyzer containing gamma-alumina and nickelic oxide for autothermic splitting fuels |
| US4495308A (en) * | 1983-03-04 | 1985-01-22 | Chevron Research Company | Two-region spherical catalysts |
| US4465789A (en) * | 1983-04-04 | 1984-08-14 | American Cyanamid Company | Hydrotreating catalyst support having dual pore structure |
| FR2572088B1 (en) * | 1984-10-24 | 1987-07-24 | Inst Francais Du Petrole | PROCESS FOR CATALYTIC HYDROTREATMENT OF HEAVY HYDROCARBONS, IN FIXED OR MOBILE BED, WITH INJECTION OF A METAL COMPOUND INTO THE LOAD |
| US4827072A (en) * | 1986-06-06 | 1989-05-02 | Uop Inc. | Dehydrogenation catalyst composition and hydrocarbon dehydrogenation process |
| US4716143A (en) * | 1986-06-06 | 1987-12-29 | Uop Inc. | Dehydrogenation catalyst composition |
| US4762960A (en) * | 1987-02-25 | 1988-08-09 | Uop Inc. | Dehydrogenation catalyst composition and paraffin dehydrogenation |
| DE3719635A1 (en) * | 1987-06-12 | 1988-12-29 | Basf Ag | METHOD FOR PRODUCING SHELL CATALYSTS |
| AU599179B2 (en) * | 1987-12-17 | 1990-07-12 | Uop Inc. | Layered dehydrogenation catalyst particles |
| HU202127B (en) * | 1988-06-08 | 1991-02-28 | Mta Mueszaki Kemiai Kutato Int | Device for producing granules by rolling-layer technology |
| US5200382A (en) * | 1991-11-15 | 1993-04-06 | Exxon Research And Engineering Company | Catalyst comprising thin shell of catalytically active material bonded onto an inert core |
| DE4239876C1 (en) * | 1992-11-27 | 1994-07-28 | Degussa | Process for the uniform and reproducible shell impregnation of fixed bed catalyst supports in bulk and device for carrying out the process |
| US6177381B1 (en) | 1998-11-03 | 2001-01-23 | Uop Llc | Layered catalyst composition and processes for preparing and using the composition |
| US6683024B1 (en) | 2000-03-15 | 2004-01-27 | Conocophillips Company | Desulfurization and novel sorbents for same |
| DE10015250A1 (en) * | 2000-03-28 | 2001-10-04 | Basf Ag | Shell catalyst for gas phase hydrogenation |
| FR2858980B1 (en) * | 2003-08-19 | 2006-02-17 | Inst Francais Du Petrole | USE OF A CATALYST COMPRISING A SILICON B FUEL SUPPORT IN A SELECTIVE HYDRODESULFURATION PROCESS |
| US8227369B2 (en) * | 2005-05-25 | 2012-07-24 | Celanese International Corp. | Layered composition and processes for preparing and using the composition |
| US7638459B2 (en) * | 2005-05-25 | 2009-12-29 | Uop Llc | Layered composition and processes for preparing and using the composition |
| US7453016B1 (en) * | 2005-12-20 | 2008-11-18 | Uop Llc | Selective hydrogenation process using layered catalyst composition and preparation of said catalyst |
| US7816571B2 (en) * | 2006-12-15 | 2010-10-19 | Uop Llc | Selective hydrogenation process using layered catalyst composition |
| US20080176737A1 (en) * | 2006-12-15 | 2008-07-24 | Antoine Negiz | Process for preparing a layered catalyst composition for a selective hydrogenation process |
| US7749375B2 (en) | 2007-09-07 | 2010-07-06 | Uop Llc | Hydrodesulfurization process |
| US8168561B2 (en) * | 2008-07-31 | 2012-05-01 | University Of Utah Research Foundation | Core shell catalyst |
| US20100152026A1 (en) * | 2008-12-16 | 2010-06-17 | Gajda Gregory J | Layered Sphere Catalysts with High Accessibility Indexes |
| US20100152507A1 (en) * | 2008-12-16 | 2010-06-17 | Gajda Gregory J | Process for Using Layered Sphere Catalysts with High Accessibility Indexes |
| US8372773B2 (en) * | 2009-03-27 | 2013-02-12 | Uop Llc | Hydrocarbon conversion system, and a process and catalyst composition relating thereto |
| US20100331588A1 (en) * | 2009-06-29 | 2010-12-30 | Gajda Gregory J | Process for Using Layered Sphere Catalysts with High Accessibility Indexes |
| US20100331171A1 (en) * | 2009-06-29 | 2010-12-30 | Gajda Gregory J | Layered Sphere Catalysts with High Accessibility Indexes |
| EP2186784A3 (en) | 2010-01-27 | 2010-09-01 | Shell Internationale Research Maatschappij B.V. | Process for the preparation and recovery of olefins |
| EP2186783A3 (en) | 2010-01-27 | 2010-09-01 | Shell Internationale Research Maatschappij B.V. | Process for the preparation of olefins |
| KR101527845B1 (en) | 2013-12-04 | 2015-06-16 | 희성촉매 주식회사 | Preparation of dehydrogenation catalysts for hydrocarbons using sponge-type supports |
| KR101814451B1 (en) | 2015-11-10 | 2018-01-04 | 희성촉매 주식회사 | A stabilized active metal complex based catalyst for dehydrogenation of straight-chain hydrocarbons |
| KR101716170B1 (en) | 2015-11-10 | 2017-03-14 | 희성촉매 주식회사 | A stabilized active metal complex based catalyst for dehydrogenation of light straight-chain hydrocarbons |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2478194A (en) * | 1944-11-02 | 1949-08-09 | Houdry Process Corp | Catalyst pellet |
| GB676615A (en) * | 1946-08-10 | 1952-07-30 | Standard Oil Dev Co | Improvements in or relating to processes involving the contacting of finely divided solids and gases |
| US2507496A (en) * | 1947-12-31 | 1950-05-16 | Houdry Process Corp | Molded contact masses |
| GB1018034A (en) * | 1961-09-27 | 1966-01-26 | British Petroleum Co | Thin film alumina catalysts |
| US3420784A (en) * | 1966-01-13 | 1969-01-07 | Engelhard Ind Inc | Silver and silver-containing copper-cadmium oxide-zinc oxide-barium oxide catalysts |
| US4077912A (en) * | 1972-10-12 | 1978-03-07 | Standard Oil Company | Catalysts useful for exothermic reactions |
| US4009125A (en) * | 1974-08-19 | 1977-02-22 | Basf Aktiengesellschaft | Spherical refining catalyst and process for its manufacture |
| US4083771A (en) * | 1976-09-01 | 1978-04-11 | Uop Inc. | Hydrorefining of petroleum fraction utilizing a catalyst prepared with an anion complex of a group VI-B and a group VIII metal component |
-
1979
- 1979-01-03 US US06/000,844 patent/US4255253A/en not_active Expired - Lifetime
-
1980
- 1980-07-07 CA CA355,610A patent/CA1131674A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US4255253A (en) | 1981-03-10 |
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